The native speaker's grammatical competence is reflected in two types ofintuition which speakers have about their native language(s) — (i) intuitions
about sentence well-formedness, and (ii) intuitions about sentence structure.
The word intuition is used here in a technical sense which has become stand-
ardised in Linguistics: by saying that a native speaker has intuitions about the
well-formedness and structure of sentences, all we are saying is that he has the
ability to make judgments about whether a given sentence is well-formed or
not, and about whether it has a particular structure or not. [...]